More common in Ford and Dodge the New Process 435 was used in some Chevy’s 70 to 76 if it has a cast iron case and an aluminum top cover with the PTO port on the passenger side it is likely a NP435. This is a very tuff transmission however if you plan to use it 4th gear is not 1 to 1 it is 1.74 to 1 so you will want a little taller gears in the rear.
Hope this helps
